Incandescent electric lamp socket



March 25, 1941. BQ sTEcHBART INCANDESCENT ELECTRIC LAMP SOCKET Filed Aug. l5, 1939 2 Sheets-Sheet 1 /7 9 f ,fr 5 gil( v i 2/ 6\ x /7 5 fe A/f Hl, 2; 6 f- 'i n 5f y l -I .IIL- "f6 o a 26 -^/a `f 2,2

March 25, 1941. B. sTEcHBART INCANDESCENT ELECTRIC LAMP SOCKET Filed Aug. 15, 1959 2 sheets-sheet 2 Patented Mar. 25, 194i UNITED STATES PATENT orf-Fics 2,236,357 INCANDESCENT ELECTRIC LAMP SOCKET Bruno Stechbart,'Chicago, Ill., assignor to The Bell & Howell Gompany, Chicago, Ill., a corporation of Illinois Application August 15, 1939, Serial No. 299,264

6Claims.

inverted position-in a lamp house of a picturev projecting machine.

With this object in view my invention. consists in certain features of novelty in the construction,

combination, and arrangement of parts by which the said object and certain other objects, hereinafter appearing, are effected all as fully described with `reference to the accompanying drawings, and more particularly pointed out in the appended claims.

Figure 1 is a substantially axial plane sectional view on the line l-l of Figure 5 of a lamp socket embodying my invention and having an incandescent electric lamp mounted therein;

Figure 2 is a top plan view of the same;

Figure 3 is a side elevation taken in elevation similar to Figure 1, with partsbroken away and shown in section and showing parts in different positions than those in which they are shown in Figure l;

Figure 4 is a partial section substantially on the line lil-4 of Figure 5;

Figure4 5 is a. sectional view substantially on the line 5-5 of Figure 2; and

Figure 6 is a view taken in elevation similar to Figure 5 with parts removed.

Referring to the drawings, i designates a vertically disposed 'inner enclosure of alamp house such as is disclosed in my o o-pending U. S. patent application, Serial No. 284,890, led July 1'1, 1939, for improvement in Ventilated lamp house. Secured at the upper end ofthe enclosure i is a main lamp socket part or body 2 of suitably molded insulating material provided with a vertical bore 3 therethrough and arranged' centrally of the lamp house enclosure. See particularly Figure 1. Molded in the body' 2 and di coaxial with the vbore 3. is an annular metal member 4 which projects inwardly from the surface of the bore 3 and forms an upwardly facing annular contact.

A second socket part 5 of suitable molded .insulating material, inthe natureof a cover for the top of the body 2, is pivotally mounted, as

Vterminal enclosure '26 which is .is provided with a vertlcaliriartition 21.

designated at 6, on a horizontal axis at one side of the bore 3 whereby the socket part 5 is mounted on the body for pivotal movement with respect thereto corresponding with .the axis of the annular contact member 4. A resilient`metal contact member 1 is secured at one end on the under face of the socket part 5 by means of rivets 8,

and extends from the rivets toward the pivot mounting 6 across the axis of the annular contact member 4. The member 'l is provided with a downward extrusion 9 forming an end contact arranged centrally of the annular contact mexnber 4 when the socket part 5 is in closed position as .shown in Figure 1, and a. coiled compression spring `Il is arranged between the socket part 5 and the member l at the extrusionQ and yieldably urges the member 1 downwardly, downward movement of the member l being'limited by a lug I2 underlying the free end of themember l.

As so constructed, the socket is adaptedl to have an incandescent electric lamp I3 installed therein andremoved therefrom by passage of` the body is of the lamp through the bore 3 and that of the annular contact member il, the base i5 of the lamp being provided with-an annular contact I6 axially engageable downwardly on the annular contact member 4 and with an end contact l1 engageable'wlth the end contact 9 when the socket part 5 is in closed position as' shown in Figure 1, thus holding the lamp in position with the annular contact member d engaging the annular contact I6. The lamp contact I6 is provided with a lug I8 for engagement in a slot I9 in the annular member 4 to angularly position the lamp in the socket. a

During installation and removal of the lamp Y the socket part 5 is of course positioned out oi closed position upwardly from the partially open position shown in Figure 3, and the socket part 5 is releasably secured in closed position engaging the Socket contacts with the corresponding contacts of the lamp base by means of a spring latch 2l releasably engageable over the top of the socket part See Figures 1 and 3. The latch 2| is secured with the socket 2 by means of screws 22 securing the latch ona cover plate' which, with a plate of insulating material 24, is secured on the side of the socket body 2 by screws 25. See Figures 1 and 4.

The socket body 2 is provided with a circuit closed byl the insulating plate Rand the cover plate 2'3 and'wlli'iil; at the sidel of the terminal enclosure is dispos bore 3 opposite that on which the pivot G of the socket part 5 is disposed. See Figures 4, 5 and 6.

Circuit terminals 28, comprising nuts 29 embedded in the socket body and terminal screws 3l screwthreaded therein are arranged within the terminal enclosure 26 on opposite sides of the partition 21 for the securing of circuit wires 32 thereto. A resilient upwardly extending circuit contact 33 is secured on one of the circuit, terminals 28, and a resilient upwardly extending opposing circuit contact 34 is secured on an extension 35 of the annular contact member 4 by a screw 36. These circuit contacts are arranged within the terminal enclosure 26 on one side of the partition 21, and a circuit contact 31 ,is secured 'on the socket part 5 to contact between the circuit contacts 33 and 34 when the socket part 5 is in closed or lamp holding position to connect the annular contact member 4 with the corresponding terminal 28.

A resilient upwardly extending double circuit contact 38 is secured on the other of the circuit terminals 28, and a circuit contact 39 is formed integrally with the end contact member 1 to contact the circuit contact 38 when the socket part 5 is in closed position to connect the member 1 with the corresponding terminal 28.

Thus, circuit connections with the socket terminals are made when the socket part 5 is in lamp holding or closed position. However, when the socket part 5 is moved upwardly out of its lamp holding position the circuit contacts 31 and 39 disengage from the corresponding circuit contacts and thus break the circuit to both of the socket contacts with resultant safety in the installation and removal of a lamp, it being observed that the arrangement is both simple and compact.

While I have thus described my invention, I do not wish to be limited to the precise details described'as changes may be readily made without departing from the spirit of my invention, but having thus described my invention I claim as new and desire to secure by Letters Patentvthe following:

1. An incandescent electric lamp socket comprising a bored socket part of insulating material provided with an annular conductive contact adapted to have a lamp installed therein by passage of the body ofthe lamp therethrough and said contact being axially engageable with a corresponding contact of the lamp base, a second socket partl of insulating material pivotally mounted with respect to said Iirst mentioned socket part for movement corresponding with the axis of said annular contact and provided with a conductive end contact movable therewith into circuit breaker element carried by said second socket part and adapted to project into said terminal enclosure for engagement with said first mentioned circuit breaker element.

2. lAn incandescent electric lamp socket comprising a bored socket part of insulating material sage of the body of the lamp therethrough and said contact being axially engageable with a corresponding contact of the lamp base, a second socket part of insulating material pivotally mounted on said rst mentioned socket part for movement corresponding with the axis of said annular contact and provided with a conductive end contact movable therewith into and out of position engaging a corresponding contact of the lamp base and holding'the lamp with said annular contact engaged with the corresponding contact of the lamp base, latch means releasably securing said second socket part in said position, said rst mentioned socket part being provided with a circuit terminal enclosure, and two sets of circuit breakers one set for each of said socket contacts and each set of circuit breakers comprising a circuit breaker element carried by said rst mentioned socket part and disposed in said terminal enclosure and another circuit breaker element carried by said second socket part and adapted to project into said terminal enclosure for engagement with said iirst mentioned circuit breaker element.

3. An incandescent electric lamp socket comprising a bored socket partprovided with an annular conductive contact adapted to have a lamp installed therein by passage of the body of the lamp therethrough and said contact being axially engageable with a corresponding contact of the lamp base, a conductive end contact mounted for pivotal movement with respect to said socket part on an axis normal to the axis of and at one side of the bore of said socket part for movement into and out of position engaging a corresponding contact of the lamp base and holding the lamp with said annular contact engaged with the corresponding contact of the lamp base, means releasably securing said end contact in said position, and a circuit breaker for one of said socket contacts comprising a circuit breaker element carried by said rst mentioned socket part at the opposite side of `said bore and a second circuit breaker element carried by said second socket part in cooperative relation with said rst mentioned circuit breaker element.

4. An incandescent electric lamp socket comprising a bored socket part of insulating material provided with an annular contact adapted to have a lamp installed therein by passage of `the body of the lamp therethrough and said contact being axially engageable with a corresponding contact of the lamp base. a second socket part of insulating material mounted for pivotal movement on said first mentioned socket part on an axis normal to the axis of and at one side of the bore of said rst mentioned socket part and provided with a conductive end contact movable therewith into and out of position engaging a `corresponding contact of the lamp base and holding the lamp with said annular contact engaged with the corresponding contact of the lamp base, means releasably securing said second socket part in said positionand two sets of circuit breakers one set for each of said socket contacts and each set comprising a circuit breaker element carried by said rst mentioned socket part at the opposite side of said bore and a second circuit breaker element carried by said second socket part in cooperative relation with said iirst mentioned circuit breaker element.

5. An incandescent electric lamp socket comprising a bored socket part of insulating material provided with an annular conductive contact adapted to have a lamp installed therein by pas- Cil assess?.

sage of the body of the lamp therethrough and said contact being axially engageable with a corresponding contact of the lamp base, a second socket part of insulating material mounted for pivotal movement on said'irst mentioned socket part on an axis normal to the axis of and at one ,side of the bore of said iirst mentioned socket part and provided with a conductive end contact movabletherewith into and out of position en'- gaging a corresponding contact of the lamp base and holding the lamp with said annular contact engaged with the corresponding contact'of the lamp base, means releasably securing said second socket part in said position, said'rst mentioned socket part being provided with a circuit terminalv enclosure at the opposite side of said bore, and a circuit breaker for one of said socket contacts comprising a circuit breaker element carried by said rst mentioned socket part and disposed in said .terminall enclosure anda second circuit breaker element carried by said second socket socket part of insulating material .mounted for pivotal movement on said first mentioned socket part on an axis normal to the axis of and at one side of the bore of said rst mentioned socket part and provided with a conductive end contact movable therewith into and out of position engaging a corresponding contact of the lamp base and holding 4the lamp with said annular contactengaged with the corresponding `contact of the lamp base, lmeans releasably securing said second vsocket part in said position, said rst mentioned socket part being provided with a circuit terminal enclosure at the opposite side of said bore, and two sets of circuit breakers 'one set for each of said socket parts and each set of circuit breakers comprising a circuit contact carried by said first mentioned socket part and disposed in said terresponding. contact of the lamp'base, a second minal enclosure and another circuit c ontact car ried by said second socket part and adapted to project into said terminal enclosure for engagement with said iirst mentioned circuit contact,l

and the circuit breaker for said annular contact also comprising a 'third circuit contact -carried byhsaid rst mentioned socket part and 'disposed within said terminal yenclosure and engaged by .the corresponding contact on said second socket part.

, BRUNO S'I'ECHBART. 

